<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>边框属性</title>
	<style type="text/css">
		.box{
			width: 200px;
			height: 100px;
			background-color:red;
			/*border-radius: 3px  10px 30px;*/
			/*border-top-left-radius: 15px 30px;*/
			/*border-radius: 50px;*/
			/*border-radius: 50%;*/
			border-top-left-radius: 100px;
			border-top-right-radius: 100px;
			border: 5px solid purple;

		}
	</style>
</head>
<body>
	<!-- border-radius

		box-shadow 
	-->
	<div class="box"></div>

</body>
</html>